Kido Satoru is your below-average detective. One day, he recieves a letter with a ticket. The job is a simple lost item case involving a ruby ring. He accepts the case and sets off for the mansion where a young mistress, an old butler, a beautiful teacher, a lovely maid, and an ugly manservant all await his arrival. He then sets out to search for the missing ruby ring, but a bizarre spectacle of desire and shame awaits him.

It was supposed to be a simple lost item case, but it turns into a mysterious illusion filled with desire and shame. Kido Satoru calls in his assistant and discovers that the tutor and the mansevant are actually con-artists that are after the mansion's fortune. Following his hunch, Kido asks the butler what is going on and finds out that the late Master and the current Mistress are not related by blood. It is only then that Kido realizes that his past intertwines with this mansion...